If you do not specify the DNS servers, the modem router uses the DNS servers that are
configured for the IPv4 Internet connection on the Internet Setup page (see Manually Set Up
an ADSL Internet Connection on page 50, Manually Set Up a VDSL Internet Connection on
page 59, or Manually Set Up a Cable or Fiber Internet Connection on page 68).
7. Select an IP Address Assignment radio button:
•Use DHCP Server. The modem router assigns IPv6 addresses to the devices on your home network (the
LAN) through a DHCP server. This method passes more information to LAN devices, but some IPv6 systems
might not support the DHCPv6 client function. This is the default setting.
•Auto Config. The modem router automatically configures its IPv6 address based on the IPv6 protocol.
8. In the IPv6 Address/Prefix Length fields, specify the static IPv6 address and prefix length of the modem router’s
If you do not specify an address here, the modem router generates one automatically from its MAC address.
9. Select the IPv6 filtering mode:
•Secured. In secured mode, which is the default mode, the modem router inspects both TCP and UDP packets.
•Open. In open mode, the modem router inspects UDP packets only.
10. Click the Apply button.
Your settings are saved.
Set Up an IPv6 DHCP Connection
An IPv6 DHCP connection is based on a dynamic IPv6 address that a DHCPv6 server assigns to the modem router.
Follow the directions that your IPv6 ISP gave you.Note
To set up an IPv6 Internet connection with a DHCP server:
1. Launch a web browser from a computer or WiFi device that is connected to the network.
2. Enter http://www.routerlogin.net.
A login window opens.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home page displays.
4. Select ADVANCED > Advanced Setup > IPv6.
Manage the Internet Settings Manually
Nighthawk X4S AC2600 WiFi VDSL/ADSL Modem Router Model D7800